User manual GARMIN SL 70 TRANSPONDER

[. . . ] The displayed altitude is the same as is sent for Mode C interrogation replies. When the HLD button is pressed, the altitude display will be set to "+000. " The altitude display values will increase/decrease as the aircraft changes altitude. The altitude display will flash when the aircraft change in altitude exceeds the selected threshold. Apollo Mode C Transponder ® Setting the Hold Altitude 1. [. . . ] The SL70 is "on" and will transmit its squawk code when interrogated. The SL70 is "on" and will transmit its squawk code and altitude when interrogated. VFR Press VFR once to set the VFR squawk code. Press VFR a second time to toggle between the VFR squawk code and the previously entered code. HLD Press to enable/disable altitude hold. The LED above the HLD button is lighted when altitude hold is enabled. The Apollo SL70 Mode C Transponder complements the Apollo SL series of slimline avionics. The SL70 provides Mode A/C functionality certified to TSOC74c Class 2A meeting VFR and IFR requirements, operates on 10-35 VDC, includes squawk code display and selection, standby, altitude, and ident operation. All of these features are contained in the space-saving 1. 3"H x 6. 25"W form factor, with bright easy-to-read LED characters, and user-friendly operation. A photocell on the front of the SL70 adjusts the LED intensity for ambient light conditions. The SL70 will automatically test its receive function if no interrogations have been received in the last 30 seconds. Knobs A single knob on the left side controls power on/off. Rotate the knob clockwise to turn transponder power on. Rotate the knob counterclockwise to turn power off. Selecting a Squawk Code The selected squawk code will always be in use. As you change a squawk code, the original code will be sent until you are finished selecting the new code. When changing a code, the display will stop flashing and selection is stopped if the controls are not used for three seconds or more. Pressing any pushbutton will also end code selection. The squawk code is automatically reset to the VFR code when the SL70 is turned back on. [. . . ] Turning the small, inner knob changes values. Pushbuttons Press the pushbutton once to activate the selected operation. An LED above each pushbutton will light when that button is pressed. IDENT Press the IDENT button once to reply with an identifying squawk code, Ident mode. In Ident mode, the Reply LED will be lighted for 20 seconds. [. . . ]